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Carbon‐13 chemical shifts of bicyclic compounds
Author(s) -
Lippmaa E.,
Pehk T.,
Paasivirta J.,
Belikova N.,
Platé A.
Publication year - 1970
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270020609
Subject(s) - bicyclic molecule , chemical shift , chemistry , anisotropy , spectral line , carbon fibers , proton , hydrogen , nmr spectra database , computational chemistry , stereochemistry , organic chemistry , materials science , physics , quantum mechanics , astronomy , composite number , composite material
13 C NMR absorption spectra of 50 bicyclic hydrocarbons, alcohols and ketones have been measured, in addition to some terpenes. The 13 C chemical shifts are approximately additive for similar compounds and can be used for the determination of molecular structure; they differ for endo ‐ and exo ‐isomers, just as in proton spectra. These quite regular and predictable 13 C shift differences are much larger and are caused by the 1,4‐nonbonded interaction between atoms heavier than hydrogen, not by magnetic anisotropy effects.